<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    // 以下结果输出
    function Foo() {
        getName = function(){
            alert(1);
            return this;
        }
    }
    Foo.getName = function(){
        alert(2);
    }
    Foo.prototype.getName = function () {
        alert(3);
    }
    var getName = function(){
        alert(4);
    }
    function getName(){
        alert(5);
    }
    Foo.getName();                     //2
    getName();                         //4
    Foo().getName();                   //1
    getName();                         //1
    new Foo.getName();                 //2
    new Foo().getName();               //3
    new new Foo().getName();           //3

</script>
</html>